Weight input
Enter any weight.
Type into any field — kilograms, pounds, or stone and pounds — and the others update instantly.
Stone & Pounds (st & lb)
Formula
1 stone = 14 pounds = 6.350 kg · 1 kg = 2.205 lb · 1 lb = 0.4536 kg
Health
Stone Weight Calculator
Convert kg, lbs, and stone back and forth in real time — no sign‑up, no maths.
kglbsstoneconversionweight
All conversions
Your weight, every way.
See your weight in stone & pounds, total pounds, and kilograms — all at a glance.
Enter a weight above to see all conversions.
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What this does
Converts body weight between stone and pounds (the format used in the UK and Ireland), kilograms, and pounds. Enter a value into any field and the other fields update instantly, so you can read your weight in every common unit without doing the math yourself.
Who it is for
Anyone who tracks body weight in stone and wants to understand their weight in kilograms or pounds. Also useful for people moving between countries where different weight units are the norm, for medical forms that ask for weight in kg, or for fitness tracking across regions.
How it works
The calculator uses the standard conversions: 1 stone = 14 pounds, and 1 pound = 0.45359237 kilograms. When you type into any field, the other fields are recalculated using these constants. Results are rounded to one decimal place for readability.
Limitations
Results are rounded to one decimal place, which is sufficient for body weight but not for scientific or dosing precision. The calculator does not support fractional stones — the stone field is always a whole number, with the remainder shown in pounds.
Key calculations
- Stone to pounds
- Total pounds = stone × 14 + remaining pounds. For example, 11 st 7 lb = 11 × 14 + 7 = 161 lb.
- Pounds to stone
- Stone = ⌊total pounds ÷ 14⌋. Remaining pounds = total pounds − stone × 14. For example, 161 lb → ⌊161 ÷ 14⌋ = 11 st, remainder = 161 − 154 = 7 lb.
- Kilograms to pounds
- Pounds = kilograms ÷ 0.45359237. For example, 75 kg → 75 ÷ 0.45359237 ≈ 165.3 lb.
- Pounds to kilograms
- Kilograms = pounds × 0.45359237. For example, 161 lb → 161 × 0.45359237 ≈ 73.0 kg.
Reference ranges
- Common conversions
- 63.5 kg = 10 st 0 lb = 140 lb. 70 kg = 11 st 0 lb = 154.3 lb. 76.2 kg = 12 st 0 lb = 168 lb. 82.5 kg = 13 st 0 lb = 182 lb. 88.9 kg = 14 st 0 lb = 196 lb.
- Average adult weight
- The average UK adult male weighs about 13 st 3 lb (≈ 84 kg / 185 lb); the average UK adult female weighs about 11 st 0 lb (≈ 70 kg / 154 lb). These are population-level figures and vary by age, height, and other factors.
- Weight loss milestones
- Losing 1 stone (14 lb / 6.35 kg) is a common weight-loss milestone in the UK. Two stone (28 lb / 12.7 kg) is another popular target often set by people on long-term health plans.
How to use it
- 1.Enter any known weightType your weight into any field — kilograms, pounds, or stone and pounds — whichever you know. All other fields update instantly.
- 2.Use stone and poundsEnter a whole number in the Stones field and the remaining pounds in the Lbs field. The calculator shows your equivalent weight in kilograms and total pounds.
- 3.Read the conversionsSee your weight expressed in all three common formats: stone and pounds, total pounds, and kilograms. Rounding is applied to one decimal place.
- 4.Compare across unitsCompare your weight across the three units side by side, or use the quick-reference table for common weights without typing.
There are exactly 14 pounds in 1 stone. This is the standard conversion used in the UK and Ireland for measuring body weight. The stone is never used for anything other than body weight (and sometimes for measuring the weight of a person in sports like boxing or horse racing).
1 stone equals approximately 6.35 kilograms. More precisely, 1 stone = 6.35029318 kg. For body weight purposes, rounding to 6.35 kg per stone is standard. For example, 10 stone = 63.5 kg, 11 stone = 69.85 kg, and 12 stone = 76.2 kg.
The stone (abbreviated 'st') is a traditional British and Irish unit for measuring body weight. It dates back to medieval trade practices and was standardised to 14 pounds in 1835. While most Commonwealth countries have now officially adopted metric, the stone remains the dominant way people talk about body weight in the UK and Ireland in everyday conversation.
Divide kilograms by 0.45359237 to get total pounds, then divide that by 14. The whole number is the stones, and the remainder is the pounds. For example: 75 kg → 75 ÷ 0.45359237 = 165.35 lb → 165 ÷ 14 = 11 stone, remainder 11.35 ≈ 11 lb. So 75 kg ≈ 11 st 11 lb.
Multiply the stones by 14 and add the remaining pounds to get total pounds. Then multiply total pounds by 0.45359237 to get kilograms. For example: 11 st 7 lb → (11 × 14) + 7 = 161 lb → 161 × 0.45359237 = 73.03 kg.
No. In everyday use, stones are always whole numbers. The remainder is always given in pounds. You would never say 11.5 stone — you would say 11 stone 7 lb. This calculator respects that convention: the stone field accepts only whole numbers, and the remainder appears in the pounds field.
The calculator uses the standard conversion factor (1 lb = 0.45359237 kg) and rounds results to one decimal place. This is adequate for most everyday and fitness purposes. For clinical or pharmaceutical dosing, use a medical-grade conversion tool that preserves full precision.
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